Colored optical fiber, optical fiber ribbon, and optical fiber cable

Abstract

The present invention provides a colored optical fiber that shows anti-microbend property and hot-water resistance, an optical fiber ribbon that utilizes the same, and an optical fiber cable.

It is a colored optical fiber 1, which comprises two coating layers of a primary coating layer 31 and a secondary coating layer 32, wherein either one of the primary coating layer 31 or the secondary coating layer 32 is colored, both coating layers have equilibrium elastic moduli of 60 MPa or less, and the secondary coating layer 32 has a relaxation modulus of 410 MPa or more, an optical fiber ribbon 4 that utilizes it, and an optical fiber cable 8.

Description

TECHNICAL FIELD [0001]The present invention relates to a colored optical fiber that is enclosed in an optical fiber cable. In particular, it relates to a double-layered colored optical fiber, wherein the primary or secondary layer of the optical fiber is colored, so that a colored layer is abbreviated, an optical fiber ribbon that utilizes it, and an optical fiber cable.BACKGROUND ART[0002]Generally, a colored optical fiber comprises a triple-layered structure of a primary coating layer that shows buffering function, a secondary coating layer that serves as a protection layer, and a thin colored layer of about 2 to 10 μm for identification purposes. A colored optical fiber is used, for example, by applying a ribbon layer on the periphery of the colored layer to form an optical fiber ribbon, and packaged in a ribbon-slot-type cable. For an optical fiber ribbon, single core separability is required in order to obtain connectivity between the colored optical fibers. That is, it is requ...

AI Technical Summary

Benefits of technology

[0015]By utilizing the colored optical fiber of the present invention, a colored optical fiber, in which transmission loss is less likely to increase even when immersed in hot water, which shows good anti-microbend property, can be attained, and an optical fiber ribbon that utilizes it, as well as an optical fiber cable, can be realized.

Problems solved by technology

When the relaxation modulus is lowered, as in the optical fiber disclosed in Patent Document 1, superior hot-water resistance is achieved, but the secondary coating layer becomes flexible, and the anti-microbend property tends to deteriorate.

Hence, it was difficult to attain both anti-microbend property and hot-water resistance.

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